Leadtools.Annotations.Core Namespace > AnnObject Class : GetInvalidateRect Method |
public virtual LeadRectD GetInvalidateRect( AnnContainerMapper mapper, IAnnObjectRenderer renderer )
Public Overridable Function GetInvalidateRect( _ ByVal mapper As AnnContainerMapper, _ ByVal renderer As IAnnObjectRenderer _ ) As LeadRectD
public virtual LeadRectD GetInvalidateRect( AnnContainerMapper mapper, IAnnObjectRenderer renderer )
public LeadRectD getInvalidateRect(AnnContainerMapper mapper, IAnnObjectRenderer renderer)
Use this method to obtain the current physical rectangle of the object. The mapper and renderer are required to calculate the correct pixel size of the rectangle.
The automation will typically perform invalidation on the automation control like this:
// Get current physical rectangle of the object
LeadRectD oldRectangle = annObject.GetInvalidateRect(mapper, renderer);
// Modify annObject, for example
annObject.Translate(10, 10);
// Get the new physical rectangle of the object
LeadRectD newRectangle = annObject.GetInvalidateRect(mapper, renderer);
// Get the union of old and new rectangles
LeadRectD invalidateRect = LeadRectD.UnionRects(oldRectangle, newRectangle);
// Invalidate the viewer control so the object is erased and then re-drawn at the new location
automationControl.AutomationInvalidate(invalidateRect);